Safety attachment for boilers



Nov. 22, 1927.

SAFETIY ATTACHMENT FOR BOILERS Filed July 22, 1926 2 Sheets-Shet 1 I gwmnto'o Nov. 22, 1927. I 1,650,212

A. T. HEDRICK SAFETY ATTACHMENT FOR BOILERS Fild July 22, 1926 2 Sheets-Sheet 2 Patented Nov. 22, 1927,

UNITED STATES;

ABE T. HEDRICK, OF HIGH ISLAND, TEXAS.-

SAFETY ATTACHMENT FOR BOILERS.

Application filed July 22,

This invention relates to new and useful improvements in a safety attachment for boilers.

One object of the invention is to provide an attachment of the character described, specially adapted for application to boilers utilizing oil as a fuel and provided for the I purpose of cutting off the supply of fuel when the water gets too low in the boiler.

Another object of the invention is to provide a safety attachment of the character described which may be cheaply and easily constructed and readily installed and which is positive in its action.

lrVith the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a front elevation of a boiler with the attachment applied thereto.

Figure 2 shows a fragmentary side elevation of the attachment.

Figure 3 shows a fragmentary plan view thereof, and

Figure 4 shows a fragmentary side view thereof. V

Referring now more particularly to the drawings, wherein the numerals of refer ence designate similar parts in each of the figures, the numeral 1 refers to a boiler having the oil burner 2 entering the combus tion chamber thereof which is supplied with oilthrough the line 3. This line has a gate valve 1 to the stem of which the trip lever 5 is attached. Fastened to the oil line 3 there is a bracket 6 which is formed with along bearing 7 in which the stub shaft 8 is rotatably mounted. Fastened to one end of this shaft and depending therefrom there is the latch 9 whose lower end normally engages under the free end of the trip lever 5 to hold the valve 4 in opened position. This trip lever has the suspended weight 10 and when the latch 9 is disengaged away from said lever this weight actuates the lever and ploses the valve 4 and shuts off the supply of uel.

Fixed to theother end of the shaft 8 there is an arm 11 whose free end carries the weight 12 which normally'holds the latch 9 in engagement with the trip lever 5.

It is apparent that pull springs may be 1926. Serial No. 124,169.

subsdtituted for the weights 10 and 12 if desire There is a water gauge 13 connected into the boiler, the lower end of the gauge being connected into the boiler approximately four inches above the crown sheet.

There is a thermostat consisting of a tubular member 14 and the fulcrum rod 15 with a lift arm 16 pivoted to the upper ends of said tubular member and fulcrum rod and the free end of this arm 16 is connected to the arm 11 through the link 17. The tube 14 is connected into the lower end ofv the water gauge and its lower end is overturned forming a bracket 18 to which the lower end of the fulcrum-rod 15 is connected.

Normally water will rise in the gauge 13 to indicate that the boiler is supplied with water but should the water get too low so that its level falls beneath the gauge steam will then enter the tube 14 and will heat-the same causing its expansion and this will operate through the arm 16 'tolift the lever 11 and release the latch 9 from the trip lever 5 and the valve 4 will be closed and the supply of fuel to the burner immediately cut ofi.

hat I claim is 1. The combination with a boiler having a burner, of a supply line leading to the burner, a valve controlling said line, a trip lever normally holding the valve open, a thermostat embodying a tube connected at one end into the water chamber of the boiler beneath the normal water line and whose other end is free, a fulcrum rod, a lift arm pivoted to said fulcrum rod and said thermostat, a stub shaft, an arm secured thereto, a link connecting said lift arm and second mentioned arm, a latch on said stub shaft, said latch normally holding said trip lever in position to hold the valve open and means for positively causing said valve to be closed when said latch and trip lever have been caused to be released one from the other.

2. The combination with a boiler having a burner, of a fuel supply line leading to the burner, a valve controlling said line, a trip lever connected to and normally holding said valve open, a thermostat including an upstanding tube connected into the water chamber of the boiler, beneath the normal water line, a lift arm supported by the upper end of said tube, a fulcrum rod, one end of which is connected to one end of said lift arm, an anchor to which the other end of said fulcrum rod is attached, a pivotally mounted latch adapted to engage said trip lever to hold it in position to maintain said valve open, an arm rigidly connected to said latch, a link Whose ends are connected to said respective arms and through which the thermostat may act to release said latch from said trip lever and means adapted to actuate the trip lever When it is released 10 to close said valve.

In testimony whereof I have signed my name to this specification.

" ABE T. HEDRIGK. 

